Valve stem



March 20, 1934- s. T. WILLIAMS ET Al.

VALVE STEM Filed April 22, 1930 Patented Mar. 20, 1934 UNITED 'STATES 1,951,460 VALVE STEM Selden T. Williams, Forest Hills, and John Wahl,

Rosedale, N. Y., assgnors to A.

Schraders Son,

Inc., Brooklyn, N. Y., a corporation of New York Application April 22, 1930, Serial No. 446,217 s claims. (cl. 285-167) The present invention relates to valve stems for tire valves or thelike, and more particularly to the manner of providing a leak-tight joint between the coupled parts of a divided or two-piece valve stem.

Heretofore pneumatic tubes for tires have been provided with one-piece valve stems, either straight or bent, the length or character of the bend being dependent upon the wheel upon which the tire was to be mounted. This necessitated the carrying in stock at service stations of a large number of pneumatic tubes so as to include the various forms of stems.

It has been proposed to equip the inner tubes with a short valve stem part of standard dimensions and to supply to the service stations or dealers valve stem extension elements fitted with Valve insides, said extension elements vbeing either straight or bent and of various lengths and angles, which, when assembled with the valve stein base part already in the tube, any desired form of valve stem can be obtained. Although this proposal has not gone into extensive use, various forms of coupling means for providing a leak-tight joint between the two valve stem parts have been proposed, but for one reason or another have been found deficient and objectionable.

According to the present invention we provide a novel manner or coupling together valve stem parts to insure a leaktight joint therebetween under all operating conditions of the wheel upon which the tire and stem are mounted. The coupling joint is of a character which permits of its quick assembly; one which insures alignment of the valve stem parts; one in which the-sealing element, should it'become defective, can be readily replaced at a nominal cost; one in which the sealing element is removably carried Aby one of the valve stem parts and held thereby against accidental loss or separation; and one in which the coupling of the valve stern parts together is not hindered or affected by variations in the rubber patch thickness to which the valve stem base part is attached. The invention also embodies other features of novelty which will be apparent from the detailed description whichA follows, reference being had to the accompanying drawing wherein Figure l is a side elevation of a two-piece valve stem, the upper stem part having a double angular bend.

Fig. 2 is a longitudinal section on an enlarged scale of the coupling joint of the valve stem shown in Fig. l.

Fig. 3 is a longitudinal section of the coupling end of the upper valve stem part, a portion of said stern being shown in elevation.

Fig. 4 is a longitudinal section ofthe valve stem base part.

Figs. 5 and 6 show two side elevational views of the sealing plug.

Fig. 7 is a top plan view of shown in Figs. 5 and. Y

Fig. 8 is a sideelevation of the sealing plug and longitudinal section of the stem base element showing the manner in which said parts are detachably connected together and held against accidental separation. @L

Fig. 9 is a top plan View of Fig. 8.

Referring to the drawing the invention is shown as applied to a so-called two-piece valve comprising a stem base part A and an upper stem part B, said parts being coupled together through the medium of an externally threaded sleeve nut C and a sealing plug D. y

The stem base part A comprises a tubular stud having a bore therethrough of dii-ferent diameters and formedat its lower end with a lateral extension ange a' adapted to engage against the inner surface of a pneumatic tube or the likefor connecting the part A thereto. lOn its exterior the stud a is provided with mutilated threads a2 and opposite flat sides a3, as is conventional with valve stems. 'I'he bore of the stud A at its top is of enlarged diameter and is internally screw-threaded, as indicated at a4,- and terminates at its lower edge in a shoulder a5 which connects with a bore of smaller diameter a6 Intermediate the ends of said bore 0.6 it is provided with an internally threaded annular rib al. Between the top of said rib and the shoulder a5 the bore a6 is of polygonal form, as shown at a8, herein shown as square with charnfered corners, the Ysame being formed with a broaching toolV in a well known manner. The top of said'broached bore or recess is concaved to provide a seating face a9.

The coupling end of the upper stem part B is provided with enlarged internal recess b which is of the same polygonal form as the recess a8, and is formed in a like manner with a broaching tool. At is open end said recess b is provided with a concave seat b of complemental form to the recess a9. In proximity to its coupling end the valve stem part B is formed with an annular liange b2 over which is mounted t0 swivel thereon an externally threaded bushing nut c, the upper part thereof being provided with wrench-engaging faces c', the threads being of a size to engage within the threaded bore porthe sealing plug esz , as shown at b;

For cooperative engagement with the Vstern parts A and B whereby said parts will be brought into true alignment when coupled together and have a leak-tight seal provided therebetween, we

, have provided a novel sealing plug element D.

This plug consists of a bodyportion d of square contour with chamfered corners, Y adapted to Vsnugly engage within the broached recess a8 and b. Intermediate the ends of this. squared body portion it is formed with an external annular groove d in which seats a compressible packing d2, the diameter of which is greater than the diagonal dimension of the body portion, said packing ld2 having oppo'sit'ely tapered or beveled seating faces d3. The plug D belowthe squared body portion is formed with a vreduced cylindrical portion d4 which, at its free end,-is slightly enlarged and externally screw-threaded, as shown at d5. The length of said reduced portion d4 is slightly greater than the depth of the broached recess a8 in order that the screwthreaded portion d5 maybe threaded through the internally screw-threaded rib `a7 in the stem base part A,'after which the squared body portion abovethe reducedpylindrical portion d4 can non-rotatably seat within the broached recess a8 and thesurface d3 of the packing d2 engage upon the seat a9. It will thus be seen that the plug D when mounted within the part A is normally held against relative rotation and is adapted for i. limited relative longitudinal movement therewith. t Y

To couple the valve stern parts A and B together, the broached recess b in the part B is tted overthe upper squared part of the plug D. yThe parts A and'B are thus held against relative rotation with respect vto each other and withtrespe'ct tothe plug D. The swivel nut c is then threaded into the bore a4, which action presses the seats a9 and bV tightly against the packing surfaces cl3 to insure a leak-tight joint between the parts.

According to the present invention as embodied in the constructions hereinbefore described, the

following advantages over formerly proposed two-pieceV valves are realized: (l) The sealing plug is free to come into alignment with the seats'on both the valve stem parts and eiect a positive leak-tight seal between the parts; (2) by having the coupling nut c engage the interior of the stem base part, all variations in the thicknessofv the rubber patches through which the valve stems pass maybe disregarded sincev there is no danger of the coupling means being'interfered with vby the bridge washer and its clamping nut; (3) the sealing plug is replaceable should it become defective due to any cause, and its removability'from the stem base part permits its installation after the completion of the vulcanizing and testing operations on the tube; (4) the plug body can be economically made from square section stock which can be exteriorly Vgrooved for application of the rubber seal. The vconstruction is such as lends itself to ready handling and efficient production; (5) the cooperative engagement between' the broached lrecess and the squared portions of the plug, serves as a locking means after assembly of the Valve parts yWhat we claim is:

l. A device of theclass described comprising two tubular members having seats, a tubular element having seats adapted for leak-tight en- 1 gagement with the seats on the members, means for normally preventing relative rotation between the element and the members, and means for coupling. together the members with their seats in engagement with the seats on the element, said element being removably carried by one of the members and held against accidental.

separation therefrom.

2. A valve stem or thev like comprisinga part" adapted for connection with a iluid receptacle, a part adapted to receive a valve, each of said parts having a seat and a bore leading rearwardly from said seat, a separable tubular plug having a pair of spaced seats adapted to engage the seats on the valve stem parts and form leaktight seals therewith and-portions adapted to engage in the bores of the valve stem parts, said plug being carried by one of the valve stern parts and adapted for limited longitudinal movement but normally held against relative rotation therewith, and means for coupling together the valve 'stem parts to press their seats into engagement with the seats on the plug.

3. A valve stem or the like comprising a part adapted for connection with a Vfluid receptacle, a part adapted to receive a valve, each of said parts having a seat and a polygonal bore leading rearwardlynfrom said seat, a separable tubular plug having a pair of spaced seats adapted to engage the seats on the valve stern parts and form leak-tight seals therewith and polygonal portions on either side of the seats adapted to non-rotatably engage in the vbores of the valve stem parts, said tubular plug being removably carried by one of the valve stern parts and held against accidentalv separation therefrom and meansfor coupling together the valve stem parts to press their seats into engagement with the seats on the plug.

4;. A valve stem part or the like having a bore therethrough, a seat, and a part extending into said bore having a seat engageable with the seat on the stem, said part being loosely carried by said stem and held against accidental removal therefrom.V

5. A valve stem part or the like having a bore therethrough,-a seat communicating with said bore, and a tubular member extending into said bore having a seat engageable with theY seat on the stem, said tubular member being adapted for limited-longitudinal movement relative to said stem and loosely carried thereby against acci- 7. A valve stern or the like comprising a part adapted for connection to a fluid receptacle and a hollow plug, said part having an internal seat, a bore leading inwardly from said seat, and an annular internally threaded rib Within said bore, and said plug having a seat engageable with the seat on the stem, a portion extending into the bore, and a screw-threaded portion adapted to engage the threads in the rib and pass therethrough to hold said plug against accidental removal from the bore.

8. A valve stern or the like comprising a part adapted for connection to a uid receptacle, said part having an internal seat, a bore leading in- SELDEN T. WILLIAMS. JOHN WAHL. 

